Don't #include <sys/ioctl.h> or <unistd.h> more than once

<unistd.h> is included by irc.h so it does not need to be included again here.

<sys/ioctl.h> only needs to be included once.

source/commands2.c

@@ -16,18 +16,16 @@ CVS_REVISION(commands2_c)
 #include <sys/utsname.h>
 #endif
 
-#include <unistd.h>
 #ifdef HAVE_SYS_UN_H
 #include <sys/un.h>
 #endif
 
 #include <sys/wait.h>
-#include <sys/ioctl.h>
+
 #ifdef HAVE_SYS_FILIO_H
 #include <sys/filio.h>
 #endif
 
-
 #include "parse.h"
 #include "server.h"
 #include "chelp.h"